can't sync macbook

Hey, anyone else have my problem? Im using 10.4.11 - I had a .mac trial year ago but let it expire. I have registered for Mobileme and all is fine on the email and syncing with ipod, but when I try to sync with .mac in systems preferences to sync contacts in my macbook etc it says my .mac trial is over!! Can't click any boxes at all! It then directs me to mobileme website but I've already registered etc. I need a software update I guess, but that is not available

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.